SELVA MARINE Blue Whale 250 EFI, Service Manual

Page: 365 / 377

6P23H11
9-20
1
2
3
4
5
6
7
8
9
Symptom 1: High engine idle speed (below 1,200 r/min)
Symptom 1: Engine stalls, unstable engine idle speed, or poor acceleration
Symptom 2 Cause 1 Cause 2 Checking step
Refer
to
page
—
Air leakage (throttle
valve-cylinder
head)
—
Check the O-rings
and gaskets of the in-
take manifold, surge
tank, and throttle
body. 4-12
4-15
Symptom 2 Cause 1 Cause 2 Checking step
Refer
to
page
Incorrect intake
cam timing
(check using the
YDIS) Variable camshaft
timing operation mal-
function Stuck oil control
valve plunger Check the oil con-
trol valve operation
using the YDIS.
Check the oil con-
trol valve plunger. 8-30
9-1
Clogged oil control
valve filter Replace the oil con-
trol valve filter. 5-41
Clogged oil pas-
sage Check the oil pas-
sage. 1-29
Stuck variable cam-
shaft timing Replace the vari-
able camshaft tim-
ing. 5-8
Troubleshooting the power unit